Not satisfied with mandating toilets that have to be flushed twice, low-flow faucets, mercury-laden fluorescent lamps, and the like, the latest push is for you to reduce your "carbon footprint" by not using hot water to wash your hands.
Using hot water to wash hands is therefore unnecessary, as well as wasteful, Carrico said, particularly when it comes to the environment. According to her research, people use warm or hot water 64 percent of the time when they wash their hands. Using that number, Carrico's team calculated a significant impact on the planet.
So there you have it, Citizen, using warm or hot water to wash your hands means that you're not doing your part to Save The Planet™. Consider yourself notified: cold water or no water. Get with the program or we may have to remove your hot water heater.